A keystone species?

Question

has little impact on the ecosystem

never goes extinct

influences the survival of several other species within a community

or

has the largest population in an ecosystem

Answer 1

its the third one.

Dude are you in AP bio? i was in the same position last summer. lol. I was using Yahoo answers for my homework. But when i actually started to read the book during the year i ended up being teh best student in the class and getting a's on all the tests.